Communication switching system



Sept. 27, 1966 M. H. ESPERSETH ETAL COMMUNICATION SWITCHING SYSTEM 44 Sheets-Sheet 1 Filed Nov. 28, 1962 Sept. 27, 1966 M. H. EsPERsETH ETAL 3,275,752

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Sept' 27, 1966 M. H. EsPERsETH ETAL 3,275,752

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1. IN A COMMUNICATION SWITCHING SYSTEM, A FIRST SET OF TERMINALS, A SECOND SET OF TERMINALS, AT LEAST THREE SWITCHING STAGES ARRANGED IN TANDEM FOR SELECTIVELY ELECTRICALLY CONNECTING TERMINALS OF THE FIRST SET WITH TERMINALS OF THE SECOND SET, EACH OF SAID STAGES COMPRISING A PLURALITY OF RELAYS ARRANGED IN A PLURALITY OF COORDINATE MATRICES, EACH RELAY HAVING AN OPERATE WINDING AND A UNIDIRECTIONAL DEVICE CONNECTED IN SERIES, AT THE COORDINATE POINTS OF EACH OF SAID MATRICES; THE FIRST TWO OF SAID SWITCHING STAGES BEING ARRANGED IN GROUPS, EACH GROUP COMPRISING A PLURALITYOF SAID COORDINATE MATRICES IN THE FIRST STAGE AND A PLURALITY OF COORDINATE MATRICES IN THE FIRST STAGE ARRANGED WITH FIRST-TO-SECOND STAGE LINKS EXTENDING FROM OUTLETS OF THE FIRST-STAGE MATRICES TO INLETS OF THE SECONDSTAGE MATRICES WITH EACH OUTLET OF ANY FIRST-STAGE MATRIX CONNECTED TO AN INLET OF A DIFFERENT SECONDSTAGE MATRIX; THE THIRD OF SAID SWITCHING STAGES BEING ARRANGED IN GROUPS OF MATRICES WITH SECOND-TO-THRID STAGE LINKS INTERCONNECTING OUTLETS OF THE FIRST-SECOND STAGE GROUPS TO THE INLETS OF THE THIRD-STAGE GROUPS WITH EACH OUTLET OF ANY FIRST-SECOND STAGE GROUP CONNECTED TO AN INLET OF A DIFFERENT THIRD-STAGE GROUP; TO THEREBY FORM ONE AND ONLY ONE PATH INCLUDING ONE COORDINATE POINT RELAY OF EACH STAGE BETWEEN ANY TERMINAL OF SAID FIRST SET AND ANY TERMINAL OF SAID SECOND SET; MEANS TO IDLE TEST SAID LINKS, MEANS TO SELECT A TERMINAL OF THE FIRST SET AND A TERMINAL OF THE SECOND SET A THE ENDS OF A PATH HAVING THE FIRST-SECOND STAGE LINK AND THE SECOND-THIRD LINK IDLE, MEANS TO APPLY A FIRST MARKING POTENTIAL TO SAID SELECTED TERMINAL OF THE FIRST SET AND SECOND MARKING POTENTIAL TO SAID SELECTED TERMINAL OF THE SECOND SET WHICH PRODUCES A POTENTIAL DIFFERENCE IN THE FORWARD DIRECTION OF SAID DEVICES BETWEEN THE TWO SELECTED TERMINALS THROUGH A SERIES PATH INCLUDING THE OPERATE WINDING AND UNIDIRECTIONAL DEVICE OF ONE COORDINATED POINT RELAY OF EACH OF SAID STAGES, WHICH CAUSES SAID RELAYS IN THE PATH BETWEEN THE SELECTED TERMINALS TO OPERATE AND THEREBY ESTABLISH A COMMUNICATION PATH; THE ONLY POTENTIALS APPLIED TO SAID SERIES PATH TO ESTABLISH A CONNECTION BEING THE POTENTIALS APPLIED TO SAID SELECTED TERMINALS. 